Improvement in furnaces for smelting scrap-iron



ADOLPH OTT, OF VNEW YORK, N. Y.

IMPROVEMENT IN FURNACES FOR SMELTING SCRAP-IRON.

Specification forming part of Letters Patent No. 107,712, dated September 27, 1870.

I, ADoLPH Ornor N ew York, in the county of New York and State of New York, have in`` vented certain Improvementslin Furnaces for Smelting Scrap-Iron, of which the following is aspecication: 7

My invention relates to Vthe combination of a generator-furnace with a reverberatory furnace having one or Several hearths or sumps, inwhich the iron to be melted is placed; also, with a system of blast or nose pipes, which are connected with a hot-blast pipe, and terminate within the elliptical vault opposite of the several tapping-holes.

The object of this invention is to secure a great and steady heat, a flame of a constant chemical composition, and the possibility7 to reduce or to oxidize at will. v

Figure lis a horizontal transverse section of my furnace after the line A B. Fig. 2 is a vertical transverse section of the same after the line y e.

a a a are the' hearths or sumps, which should be constructed of iire-proof stones or brick. c c c are working or charging doors, which are linedon the inside with a fire-proof material. lis a chamber for introducing air. g is the generator-furnace. e are lire-bars, resting on the cast-iron beams t' t'. q is the ash-hole. C is the ash-hole door. F is a door for feeding the generator-furnace. It is malde of heavy iron plates, so that it may shut we l.

P is a variously-bent iron pipe, leading from a ventilator, and serving to burn the carbureted gases produced in the generator-furnace. It passes horizontally, being bent twice, between the perforated iron plate r r and the furnace-wall n u, Where the blast is heated by radiation or contact of the ashes, the fuel, and the walls oftt-he generator-furnace. This pipe leaves the furnace at about the height of the air-chamber Z, andA turns from there first vertically upward along the furnace. Having reached a. height of about half a foot above the aforementioned furnace, it turns in a horizontal direction within a distance of half its width, in order to pass parallel with the vault in the direction of its length, as represented in Fig. 2Q A s s s are stop-cocks. f f f are nozzles or blast-pipes. They are constructed of sheetiron, and extend themselves in the form of a slit/"The aperture or mouth of such a nozzle is to consist of two heavy sheet-iron plates, i

which are connected with screw-bolts with the pipes leading from P. m is the nre-bridge. n

is the flue. t is the stack. o o are tappingholes to run off the melted iron.

The operation of the furnace described is easily understood. After the sumps have been charged with the scraps, which should be formed in packets, the furnace is charged with fuel. When the same is in full glow the ventilator is set in motion` and blast turned on. ,Y Through an opening in the working-doors the melted parts are brought in contact with the nnmelted pieces by means of a crowbar. If the iron has obtained the proper degree of fluidity, it is run olf into a mold or into an iron box lined inside with clay.

In stirring the fluid mass just before tapping it gets more homogeneous. Y The furnace is charged anew while glowing.

Instead of charging the furnace with scrapiron alone, I may mix it with gray or any other kind of pig-iron.

In turning on more blast than ordinarily, which blast will burn the carbon of the iron to carbonio oxide and carbonio acid, and separate the sulphur, phosphorus, and earthy metals, I am thus enabled to obtain a pure, line-grained white cast-iron.

In order that the scrapiron may weld if employed byitself, it is of advantage to throw sand upon it. A concentrated solution of liquid glass has also been found serviceable for this purpose.

As regards the fuel, it should be as dry as possible; but I may use an inferior fuel, as peat, lignite, bituminous and earthy coal. The blast should effect a pressure of one or two lines in the mercury-gage.

Claims.

I claim as my invention- 1. The combination of a generator-furnace, g, with a reverberatory furnace having the hearths or sumps a a a, substantially as and for the purpose hereinbefore set forth.

2. The combination of the nozzles or blastpipes ffj' with the reverberatory furnace, substantially as and for the purpose hereinbeforek set forth.

ADOLPH OTT.

Witnesses:

THo. F. WELLS, RICHARD ARcHDEAcoN. 

